Seychelles police said Tuesday that they are investigating whether the two 44-year-old American security officers consumed a substance that triggered the failure. “The police preliminary investigation report includes suspicion of drug use, as indicated by the presence of a syringe and traces of heroin which were found in the cabin,” police said in a statement.

The deceased, Jeffrey Reynolds and Mark Kennedy, were hired to deter pirates. The ship was hijacked in 2009 off the coast of East Africa. Those events inspired the 2013 Oscar nominated film Captain Philips.

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